摘要
利用民勤50年来的气象数据,对各季、年的水热风组合状况及其与风沙活动的关系进行了分析,得到的结论为:1)民勤春季以暖湿弱风蚀和暖干强风蚀组合出现较多,基本不存在冷干组合、湿强风蚀组合和冷强风蚀组合;夏季以暖干弱风蚀组合出现较多,水热组合具有明显的反相位对应关系;秋季和冬季水热风组合均比较复杂,各种组合均有出现,且都不占优势;从全年来看,民勤基本不存在冷干组合,很少出现湿强风蚀组合。民勤春季、秋季、冬季和全年未来气候可能向暖湿弱风蚀趋势发展,夏季可能向暖干弱风蚀趋势发展;2)民勤春冬季水热风组合特征对风沙活动强度可能具有滞后效应,滞后期约为3年,该滞后效应可能是由年均气温所引起,具体作用机制有待进一步研究;民勤未来气候变化趋势将有利于风沙活动强度的减弱。
The water - heat - wind combination rule and its relationship with blown - sand activity in Minqin were ana- lyzed based on the seasonal and annual meteorological data from 1956 -2006. The results were as follows： （1） Warm - wet - weak wind erosion and warm - dry - strong wind erosion climate were dominated mainly in spring and without cold -dry, wet -strong wind erosion and cold -strong wind erosion combination ;Warm- dry -weak wind erosion climate was dominated mainly. In summer, and the water- heat combination had obvious opposed - phase relation; In autumn and winter, it was complex of the water - heat - wind combination, and without dominant combination ; In the whole year, the cliamte in Minqin was complex without cold - dry combination and with rare wet - strong wind erosion combination ; The climate in the future will trend towards the warm - dry - weak wind erosion combination in summer, and will trend towards the warm -wet -weak wind erosion combina- tion in spring, autumn, winter and the whole year, which are favorable to weaken the intensity of blown - sand activity. （2） The water- heat- wind combination in spring and winter may have hysteresis to the blown -sand activity, and the hysteresis term is about 3 years, which may arise mainly from the annual average temperature.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2008年第11期38-44,共7页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金重点项目(40638038)资助
关键词
水热风组合
风蚀气候因子指数
风沙活动
滞后效应
water -heat -wind combination
wind erosion climatic factors
blown -sand activity
hysteresis
